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mp4: Don't read an empty Decoder Config Descriptor

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This commit is contained in:
Alex Converse 2011-09-21 15:26:35 -07:00
parent 20e1829dad
commit 1c2e07b811
1 changed files with 1 additions and 1 deletions
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2
libavformat/isom.c
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@ -418,7 +418,7 @@ int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext
len = ff_mp4_read_descr(fc, pb, &tag);
if (tag == MP4DecSpecificDescrTag) {
av_dlog(fc, "Specific MPEG4 header len=%d\n", len);
if((uint64_t)len > (1<<30))
if (!len || (uint64_t)len > (1<<30))
return -1;
av_free(st->codec->extradata);
st->codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);